I will check, but the latency in osd tree is for each disk, and i have high latency on all osd; this is why i don't think that the problem is related to one host or disk.
Inviato da iPad > Il giorno 15/gen/2015, alle ore 13:17, Lindsay Mathieson > <lindsay.mathie...@gmail.com> ha scritto: > >> On Thu, 15 Jan 2015 11:25:44 AM Fabrizio Cuseo wrote: >> What is strange is that on OSD tree I have high latency: tipically Apply >> latency is between 5 and 25, but commit lattency is between 150 and 300 >> (and sometimes 5/600), with 5/10 op/s and some B/s rd/wr (i have only 3 >> vms, and only 1 is working now, so the cluster is really unloaded). >> >> I am using a pool with 3 copies, and I have increased pg_num to 256 (the >> default value of 64 is too low); but OSD latency is the same with a >> different pg_num value. >> >> I have other clusters (similar configuration, using dell 2950, dual ethernet >> for ceph and proxmox, 4 x OSD with 1Tbyte drive, perc 5i controller), with >> several vlms, and the commit and apply latency is 1/2ms. >> >> Another cluster (test cluster) with 3 x dell PE860, with only 1 OSD per >> node, have better latency (10/20 ms). >> >> What can i check ? > > > POOMA U, but if you have one drive or controller that is marginal or failing, > it can slow down the whole cluster. > > Might be worth while benching individual osd's _______________________________________________ pve-user mailing list pve-user@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
